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Why choose multimodal biometrics?

Why do we require multi-modular biometric frameworks for human recognition?

Biometrics is a propelled innovation; we as a whole realize that. Its recommendable quality components make it a major resource, as a robust security measure. The researchers as well as critics do not spend a day scrutinizing its reality or discussing the protection issues it has. The contention is just in view of its coordination into national security. The greatest point being created is that, if the adversary steals and hacks the information, the outcomes could obliterate. They likewise contend that relying excessively on the innovation may one day 'reverse discharge' our reality.

Uniondale biometric structure functions individual identification because of a particular cause of biometric functioning. These classifications are usually exaggerated via the below-given tribulations:

Strident feeler facts – Clatter or Noise can be available in the acquired biometric data generally due to the improperly or defective maintained sensors.

Non-universality – When every individual in the target populace is competent to offer the biometric trait for recognition, then the attribute is said to be widespread. But, it doesn’t mean that all biometric attributes are actually universal. For instance manual workers with bruises and cuts on their fingertips, people with disabilities related to hand and individual with dry or oily fingers. A report by NIST stated that around 2% populations are not able to enroll utilizing fingerprint.

Lack of individuality – Attributes generated from biometric traits of distinct peoples can be somewhat similar. A significant fraction via the populace could possess almost alike visage manifestation resultant of hereditary aspects (for example identical twins, son and father etc)

Lack of invariant depiction – The biometric data obtained from a user at the time of verification will not be as similar to the information utilized for creating the user’s template at the time of enrollment.

Propensity to circumvention – Though it is extremely intricate to embezzle anybody’s biometric attributes, however it is even possible for an imposter to circumvent a biometric framework utilizing spoofed attributes. Behavioral attributes such as the accent and mark are more susceptible en route for these assaults than psychological attributes.


TEST PARAMETER             







Finger imprint

FVC i.e. Full Vital Capacity[2004]

20 epoch (standard age)




FRVT i.e. Face Recognition Vendor Test[2002]

mottled illumination open-air/covered




NIST i.e. National Institute of Standard and Technology[2000]

manuscript sovereign



  • Utilization of several biometric indicators to identify individuals is called as multimodal biometrics. Blending the evidence acquired on or after distinct process utilizing the effectual synthesis proposal could considerably develop an overall competency via through biometric coordination.
  • A multi function biometric scaffold could lessen the FTE/FTC levy as well offer further confrontation alongside burlesquing as it intricate in chorus parody several biometric informant.
  • Four stages of data fusion are feasible in a multimodal biometric framework. These are blend at the sensor stage, trait extraction stage, decision stage and matching score level

Multimodal Biometric System: Fusion Scenarios

In a multimodal biometric framework, there can be assortment in number of qualities and segments. They can be the following:

  • Single biometric characteristic, various sensors
  • Single biometric characteristic, various classifiers (like- particulars based matcher and surface based matcher)
  • Single biometric characteristic, various units (e.g. different fingers)
  • Various biometric characteristics of an individual (like – fingerprint, iris and so on.)

These characteristics are then worked upon to affirm the identity of the user.


You have to take into account various components while planning a multimodal biometric framework −

  • Level of security you have to acquire
  • The quantity of clients who will utilize the framework
  • Sorts of biometric qualities you have to procure
  • The quantity of biometric qualities from the clients
  • The level at which various biometric attributes require reconciliation
  • The method to be considered to coordinate the data
  • The exchange off between advancement cost versus framework execution

Each biometric framework distinguishes a man by who the individual is instead of what the individual conveys, not at all like most customary authorization frameworks, for example, individual ID numbers (PINs), ID cards, and passwords. Dissimilar to the arrangements that depend on what you own, biometric accreditations can't be lost, overlooked, speculated, or effortlessly cloned. In spite of these features, the innovation has a few confinements as well:

Environment: The surrounding in which biometric information is being acquired may affect the capacity of the framework to distinguish a person. For instance, the precision of facial acknowledgment is predisposed by facade phrase, pose, and elucidation.

Commotion the sensed information: The finger impression with a voice and scar modified through the frosty are cogs of raucous key. Uproarious information might likewise come about because of improperly maintained or defective sensors.

Intra-class varieties: Fingerprint information obtained as of an individual among justification may be poles apart from shipshape to operate in order to produce a format with recruitment because of a scattering of the finger on a catch gadget, in this way influencing the coordinating procedure.

Non-universality: Some individuals cannot physically give an independent biometric accreditation because of sickness.

Parody assaults: The charlatan might attempt to lampoon on the biometric superiority of the actually chosen patron observance in wits the ending ambition to dodge the structure.

User authentication or authentication is the strategy to determine the identity of a person. These days, the most widely recognized user authentication technique is the authentication by traditional password. This technique requires negligible computational control to have the capacity to catch the password from the user and contrast it and a predefined convention in the database. The real drawback of the password authentication technique is the dependability and latent defenselessness, especially for supposed "feeble" passwords related with deciding the real character of the user or the user.

In context to this, the authentication of password allows access to any user that "recognizes" the right password, turning it exceptionally vulnerable against parody assaults. Thus, in frameworks where security is a basic component and the genuine character of the user should be built up with high level of confidence, security supervisor depends on biometric confirmation. Biometric verification is the technique to determine any individual’s identity in light of the intrinsic behavioral or physical attributes related with the individual.

Characteristics of Multimodal Biometric Systems

Biometric verification frameworks use an assortment of techniques that use keyboard typing patterns, signature, voice, hand geometry, face, iris, fingerprints and so on to competent to perceive an entity; it gives the most grounded connection between the genuine user and the framework. Usually, a biometric verification framework works by catching the biometric characteristic of an individual and contrasting the recorded attribute and the biometric tests in a database in request to set up an individual’s identity. The requirement for building up identity in a dependable way has prodded dynamic research in the field of biometrics.

Not at all like the customary password confirmation, have biometric verification procedures (e.g voice and face recognition) required more calculation power than what is required for password validation. When it comes to password only authentication, the framework will mostly doing encryption or potentially unscrambling and after that a correlation between the one stored and typed password in the database. User confirmation through voice and face identification in still sound waves and images are alluring alternatives to upgrade get to security since it is presently ordinary to have high-resolution still cameras having sensitivity and high resolution on a wide range of computing platforms that includes smart phones, tablets, notebooks and desktops.

At present, the greater part of the biometric verification frameworks that are being used typically have a solitary biometric quality to determine verification. For instance, the Schiphol Privium method at Amsterdam's Schipol air terminal utilizes iris scan cards to boost the handling for migration. Some financial institutes in Japan have introduced palm-vein verification frameworks in their ATMs to approve the identity of a user leading an exchange. Biometric frameworks are normally categorized into two sorts; multi-biometric and uni-biometric authentication frameworks. A uni-biometric framework is one that relies on upon a solitary biometric source, (for example, face or voice biometric qualities) for user verification. Then again, the multi-biometric framework relies on several biometric sources blending them into a sole confirmation choice. Generally, biometric information are more influenced by the encompassing condition of the validating user; critical lighting varieties can make the facade of a person "look" totally diverse to the confirming gadget.

Hence, a uni-biometric framework is normally not an ideal solution, as it is more influenced by the natural conditions. To have the capacity to go around such constraint of the uni biometric frameworks, a multi-biometric frameworks offer a potential alternative. A multi-biometric verification framework takes more than one biometric characteristic, expanding the precision of the coordinating and confirmation handle. The information from every biometric source is combined, creating a last confirmation choice.

Comparison with Existing Techniques

A standard biometric confirmation framework has four significant strides as listed below:

(a) Catching the raw information of the biometric characteristic

(b) Highlight extraction that forms the raw information from the past step to extricate attributes that are a consolidated portrayal of the attribute

(c) Attribute coordinating pace that uses a classifier to contrast the extracted components and the layouts recorded in the database

(d) In the end, the verdict stride, that operates the coordinating result to each forfeit or refutes access to the validating user.

In this venture, voice and face biometric qualities are being used for the recognizable proof and confirmation of a user for handheld gadgets. Every biometric module possesses the significant qualities of a person; extort feature sets, looks at those components against a similar user's pre-stored quality layouts in a database, and overtake its choice o a combiner function or data fusion. The combiner acts as the last phase of an assembly categorization system, creates a choice with respect to the trait of the user of either denying or granting access. The processing needed for the general verification choice is circulated. The handheld gadget, for example, a cell phone or tablet catches both still photographs and voice tests from the user and conveys the related information records to server through the either Wi-Fi wireless connection or GSM/CDMA.

The server exerts the preprocessing, include filtering, extraction, and decision making calculations for every biometric module. The server executes the combiner module to produce a paired choice; the combiner module utilizes the verification choices from each of the face images and voice modules alongside certainty values and blends them to conclude a general access denied/granted choice. A dispersed server-client programming framework was produced to encourage a simulation study on genuine informational indexes in the general public domain. Testing involved utilizing cell phones, different users, verification over genuine GSM systems, and real-time decision making performance estimations.

In the recent past, if you doubted most character administration experts whether they envisioned the utilization of biometrics for individual recognition management would end up becoming standard for verification security. A lion's share would have said that the innovation could be utilized as a part of a few regions, yet no one but few could have determined the colossal scale and extent of some bigger organizations building up everywhere throughout the world.

An ideal cause behind adopting biometric innovation is because customary verification strategies thought to be omnipresent username/password are inadequate for individual character just in light of the fact that they can just give confirmation of possession or evidence of learning. However, biometrics gives interesting merits as it depends on recognizing somebody by "their identity" contrasted with "what you have" or “what you know”.

Multimodal Biometric System: Fusion Scenarios

Pro the folk who encompass customary or else philosophy regarding implementation biometrics intended for identifiable attestation, the up-to-the-minute association tackle owing to a number of extents towards the expansion through the commerce subsist whether to drive a univocal or multi-option biometric structure. Multi-tasking biometric constructions comprises the bowed hooked on the most fitting outline for several trades where lofty accuracy and precautions is required, seeing that they entail two biometric official recognition for optimistic distinctive evidence moderately than in a univocal agenda.

Exactness: Multi tasking biometrics operates statistics from the slightest two biometrics – (i.e. accent, iris, finger stamp and touch stratum mold) whilst univocal biometric scaffold employ facts commencing the one biometric – (for instance- iris, handle feature, palm, mark, tone, hand outline, or visage). The exactitude of a multi featured biometrics frame is usually established as well as the corresponding blunders and picture attainment faults. Figure procedures bungle encompass of stoppage-to-register tempo and stoppage-to-attain pace whilst synchronize slip up engross bogus non-match toll in an authentic personage is discarded and a fake bout pace wherever a charlatan is approved to. The analyst module uses different combination procedures keeping in mind the end goal to join each single sub-system choice or supposition and finally surfaced with a conclusion. That is why the multimodal biometrics is more exact than uni-modal or else authentication framework.

Reliable and Increased Gratitude: A multi modulus biometric structure permit a remarkable plane of assertion for a specific bout in substantiation and the adding up of personal verification manner. As the multi feature biometric gibbet use unusual biometric trait, each sole quality could proffer additional resistant a propos to the applicability of some character avow. For illustration, the exemplar of improvement (pace) of people to an akin relation or inadvertently of different populace could be equivalent. In the occasion so as to the similar biometric frame furthermore encompass handle seam corresponding or finger impression alike, the structure will certainly fetch regarding prolonged acceptance pace, and is roughly unfathomable that the different people comprise identical stride and in accumulation finger lode/finger prototype.

Improved Safety: An additional constructive characteristic of a multi featured biometric arrangement is which by creating consumption of diverse methods for acknowledgment, a structure can maintain superior rim recognition situation and its overseer can reconcile on a preference on the echelon of security which is requisite. For an astonishingly elevated safety province, one might require operating approximately three biometric recognizers and pro a minor safety sector, one can entail duo documentations. In the incident which the recognizers sputter for one vague basis, your construction could use a new or from the two maintaining the mind set at the conclusion to offer the specific decipherable attestation of an entity. Alongside these outline, it essentially shrinks off the possibility of yielding a fraud.

Configuration Issues with Multimodal Biometric Systems

Helplessness: Burlesquing is the utmost risk to corroboration arrangements. Multi replica and univocal biometric casing are a few instances unarmed besides misrepresentation. Falsification occurs while a discarded entity captures the aptitude to seize on the form of an accepted patron. The likely occurring threats are because of mock or forged manipulates were evaluated by a different assessment cluster and the check exhibits that phony fiddle replica with the synthetic forms can enroll in 11 attempts for exclusive blotch structure and were recognized in the verification techniques with the probability of 68% to 100%, conditional ahead the frame. In this condition, substitute thingamajig that work on synchronized multi sculpt corroboration, for paradigm, a biometric radiant inimitable blotch/handle seam auditor with livening acknowledgment could take off resizing.

Client Acceptance: Since these biometric outlining are dependable, precise, have refuge substitutes, as well could refrain from exaggeration onslaught, these background are largely accredited in frequent realms which swathe extensive to better associations. Biometric preparations which comprise considerable extent laypeople catalog are fluctuation to the structures. Conversely, in provision wherever accurateness and safety are primary, despite of the modest, multimodal configuration have bowed off to be ubiquitous.


A multimodal biometric technique combines several biometrics in creating a personal identification and it can be utilized to conquer the limits of individual biometrics. The latest technology has developed a multimodal biometric system that integrates choices done by fingerprint verification, face recognition as well as speaker authentication to create user identification. Keeping in mind to demonstrate the efficacy of this integrated framework, experiments that stimulate the functioning environment on a petite data set that is attained in laboratory environment were executed. The experimental outcomes reveal that the framework performs ideally. Nevertheless, it requires to be tested on a wide dataset in a real operating environment.

Multimodal biometric frameworks are an absolute necessity in those businesses where a definitive security and exactness is required, and where a basic oversight can lead passing to numerous people or can make awesome devastation in their ordinary life. A multimodal biometric framework is most appropriate for ventures, for example, civil ID (e-ID/national ID), healthcare, and financial enterprises. Several developed nations like USA, United Kingdom, Japan, France, Canada, and Germany already conveyed multimodal biometric framework for national id, voter registration, national social insurance or e-Passport ventures. Several under developed and developing nations are additionally leading the pack from developed nations and conveying multimodal biometric frameworks.


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[2] Jain.A et al., “An identity authentication system using Fingerprints”, In Proceedings of the IEEE (September 1997), vol. 85, pp. 1365–1388.

[3] Karthik Nandakumar et al. “Fusion in Multibiometric Identification Systems: What about the Missing Data”, to appear in Proc. of ICB, Alghero, June 2009, pp. 1-10.

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[6] Meraoumia et al., “Fusion of Finger-Knuckle-Print and Palm print for an Efficient Multi-biometric System of Person Recognition”, IEEE ICC 2011.

[7] Mohamed Soltane et al. “Face and Speech Based Multi- Modal Biometric Authentication”, International Journal of Advanced Science and Technology, Vol. 21, August, 2010, pp. 41-56.

[8] Ratha.N et al. “Adaptive flow orientation based feature extraction in fingerprint images Pattern Recognition”, Vol.11, Issue 28 (1995), pp. 1657–1672.

[9] A.Ross and R. Govindarajan, “Feature Level Fusion Using Hand and Face Biometrics”, In Proceeding of SPIE Conference on Biometrics Technology for Human Identification, volume 5779, Florida, U.S.A., March 2005, pp.196-204.

[10] Sheetal Chaudhary and Rajender Nath, “A New Multimodal Biometric Recognition System Integrating Iris, Face and Voice”, International Journal of Advanced Research in Computer Science and Software Engineering, Volume 5, Issue 4, April 2015, pp. 145-150.

[11] Dr. Shubhamgi and D.C.Manohar Bali, “Multi-Biometric Approaches to Face and Fingerprint Biometrics”, International Journal of Engineering Research & Technology, ISSN- 2278-0181, 2012.

[12]A.K. Jain, A. Ross, S. Prabhakar, "An introduction to biometric recognition",IEEE Transactions on Circuits and Systems for Video Technology, vol. 14, pp. 4-20, 2004.

[13]A. Riera, A. Soria-Frisch, M. Caparrini, T. Cester, G. Ruffini, "Multimoda1 Physiological Biometrics Authentication. In Biometrics: Theory Methods and Applications" in , John Wiley and Sons, pp. 461-482, 2009, ISBN I0: 0470247827

[14]L.H. Chan, S.H. Salleh, C. M. Ting, "Face biometrics based on principal component analysis and linear discriminant analysis", J. Comput. Sci., vol. 6, pp. 693-699, 2010.

[15] H. Abrishami, M. Ghayoumi, "Facial Image Feature Extraction using Support Vector Machine", In: International Conference of Vision T
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